Radiocontrol



July 3, 1934. M, E. SCHAEFFER RADIOCONTROL Filed Nov. 6, 1935 3Sheets-Sheet 1 Invenior N. Z. Schaffer flllomey July 3, 1934- M. E.SCHAEFFER RADIOCONTROL Filed NOV. 6, 1933 3 Sheets-Sheet 2 Inventor /V.Z fi chaeffer flllomey w AR July 3, 1934. M. E. SCZHAEFFER RADIOCONTROLFild Nov. 6, 1935 3 Sheets-Sheet 3 wAR lnvenlor Mil/$ 0k a ef/er Byflllorney Patented July 3, 1934 UNITED STATES PATENT OFFICE 2 Claims.

This invention appertains to new and useful improvements in radioreceivers, and more particularly to a novel control for tuning andregulating volume.

The principal object of the present invention is to provide a singlecontrol element which is operative to selectively control the tuningapparatus and volume control.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawings:

Figure 1 represents a fragmentary horizontal sectional view through areceiver, showing a volume control and tuning condensers assembled withthe novel selective operating means.

Figure 2 represents a detailed sectional view through the structureshown in Figure 1.

Figure 3 represents an enlarged fragmentary detailed sectional viewshowing the clutch means and the shaft arrangement.

Figure 4 represents an enlarged fragmentary detailed sectional view ofthe slidable element of the clutch.

Figure 5 represents a sectional view taken substantially on line 55 ofFigure 3.

Referring to the drawings wherein like numerals designate like parts, itcan be seen in Figure 1 that numeral 5 represents the front wall of aradio receiver cabinet. Numerals 6-'7 represent supporting platesthrough which the elongated tubular shaft 8 is journaled. The statorplates 9 are supported in the usual conventional manner, while the rotorplates 10 are secured to the aforementioned tubular shaft 8. There maybe any number of these condensers controlled by the shaft 8, dependingupon the type of radio receiver.

Numeral 11 represents a bracket secured to the plate 7 and this supportsthe volume control 12 and the receiver switch 13. A stub shaft 14extends from the Volume control 12 through the bracket 11 and isequipped with a clutch plate 15 at its inner end. The opposed end of theshaft 8 which extends through the plate 7 is equipped with a clutchplate 16, while an elongated solid shaft 17, extending through thehollow shaft 8, is equipped with a hub structure 18 provided with a pairof clutch plates 19-20 for the corresponding clutch plates 1615,respectively. Each of these clutch plates 19-20 is provided with'a frictional covering 21.

The opposite end of the solid shaft 17 extends through an opening 22 inthe front wall 5 of the The knob 23 has a collar 24 and interposedbetween this collar 24 and the plate 6 is a coiled spring 25 whichnormally tends to urge the knob 23 outwardly of the wall 5 so as tonormally maintain the clutch plate 19 engaged against the clutch plate16. Thus the station selecting condensers are always connected with theknob 23 ready for actuation.

After the station has been selected, the knob is pushed inwardly andthis results in the engagement of the clutch plate 20 against the clutchplate 15 and by holding the knob inwardly and rotating the same, theproper volume can be obtained, after which releasement of the knobdisengages the clutch from the volume control.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:-

1. In combination, a station selecting condenser, a volume control, ahollow shaft to which the rotor plates of the condenser are secured, aclutch plate on the hollow shaft, a manually operative shaft extendingthrough the said hollow shaft and being provided with a movable clutchelement engageable with the clutch plate on the hollow shaft, a stubshaft for operating the volume control, said stub shaft being providedwith a clutch plate and being located within the path of the saidmovable clutch element on the shaft extending through the said hollowshaft.

2. In combination, a station selecting condenser, a volume control, ahollow shaft to which the rotor plates of the condenser are secured, aclutch plate on the hollow shaft, a manually operative shaft extendingthrough the said hollow shaft and being provided with a movable clutchelement engageable with the clutch plate on the hollow shaft, a stubshaft for operating the volume control, said stub shaft being providedwith a clutch plate and being located within the path of the saidmovable clutch element on the shaft extending through the said hollowshaft, and a spring for normally urging the internal shaft to a positionmaintaining the movable clutch element away from the volume controlclutch plate.

MERLE E. SCI-IAEFFER.

cabinet and is equipped with a hand knob 23.

